Anti-friction bearing



(No Model.) 2 Sheets-Sheet 1.

' L. K. JBWETT.

ANTI-PRIGTION BEARING. No. 427,693. Patented Mey 13, 1890.

(Nonaudel.)y 4

l.. K. JEWBTT.

2 Sheets-Sheet 2.

. ANTI-FRIGTION BEARING.-

No. 427,693. Patented May 13, 1890.

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UNITED STATES PATENT OEETCE.

LUTHER. K. JElVETT, OF BOSTON, MASSACHUSETTS, ASSGNOR TO THE JEVETT SUPPLY COMPANY, OF PORTLAND, MAINE.

ANTI-FRICTION BEARNG..

:':PEGIIIFICATION forming part of Letters Patent No. 427,693, dated May 13, 1890.

Application tiled January 1l, 1890. Serial No. 336,636. (No model.)

To all whom it may concern:

Be it known that I, LUTHER K. J EWETT, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Anti- Friction Supports or Bearings, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its objectto provide a novel anti-friction bearing, support, or de-.

and not upon the arbor of the said rollers or balls, the latter, when two or more are used, being separated and maintained out of contact with one another by means of a spacingfranie, which is free to move with the said rollers 0r balls.

Myiniproved anti-friction device is especially adapted to be used both for a center bearing and as side bearings for the car-body; but it may be used in any place where it is desired to reduce friction.

The particular features of my invention will be pointed out in the claims at the ends of this specification.

Figure 1 is a transverse section of a sufficient portion of a car-body and its truck providedwith anti-friction devices embodying my invention to enable the said invention to be understood; Fig. 2, a top or plan view of the form ot anti-friction device preferred by ine as a side bearing for a car-body, the top or upper plate being removed; Fig. 3, a side eleA vation of the anti-friction device shown in Fig. 2; Fig. 4, a transverse section of the device sliown in Fig. 2 on line c x; Figs. 5 and G, details to be referred to; FiO. 7, a top or plan view of the anti-friction device employed as the center bearing, the top-plate being removed; Fig. 8, a section of the center bearing, shown in Fig. 7 on line jz/ y; Fig. 9, a detail of one of the rollers; Fig. l0, a detail of the car-body bolster-truss to be referred to,

and Fig. 11 a inodication to be referred to.

The car-body A, (represented by dotted lines, Fig. 1,) and the car-truck A, provided, as herein shown, with a truck-bolster a, swingplank a', suspended by links a2, only one of which is shown, bolster-sustaining springs a3, equalizer-bar a, equalizer-springs 0,5, and pedestal tie-bar a, are and may be ofany desired or well-known constructioinsuch as now commonly used on railways. The carbody A has secured to its bottom, as herein shown, a car-body bolster, (shown separately in Fig. 10,) it consisting of metallic trusses a9 am, eaoli made of a top and bottom piece, and cross-bars al? alp. The metallic trusses a al are extended crosswise of the car and the cross-bars al2 alS extend in the direction of the length of the car.

The car-truck bolster has secured to it near its center one bearing-surface of my improved center anti-friction device, the said bearing surface being shown as a substantially circular plate or casting l), (see Figs. 7 and 8,) having ears o', provided, as shown, with boltholes b2, through which are extended the bolts bx, (see Fig. 10,) by which the said plate or casting is secured to the car-truck bolster. The plate or casting l) is provided s with a central hole Z13 for the passage of the usual king-bolt, (not shown,) by which the carebody is fastened to the ear-truck. The lower casting or plate l) is provided with an annular groove or channel b4, formed between the hub b5 and an annular flange or lip 1), and the top or upper bearing-surface (herein shown as a plate or casting b?) is provided with an annular lip or Harige hs, which is adapted to extend into the annular groove b4, the said annular lip being made in practice of such depth as not to come in contact with the bottoni of the groove or channel lf* when the upper and lower bearing plates or castings are fit-ted together in operative position. The lower pla-te or casting between the annular iiange h and its outer edge or circuinference is preferably made inclined downward and provided with annular ridges or TOO guides hf Z310 to form between them a circular track or pathway, on which are supported the anti-friction devices, (shown as rollers or balls bl2,) each provided with a substantially short arbor or hub Z113, projecting from the opposite ends of the roller. The rollers lf2, as herein shown, are tapering or conical in shape, and, resting upon the lower bearingsurfaee Z2, constitute the sole support for the upper bearing-surface?)7 and the parts secured to it.

The rollers or balls Z912 have co-operating with them a spacing-frame, vherein shown as consisting of two circular rims or pieces c c', united at suitable intervals, as herein shown, by cross-pieces or tie-bars c2. The circular rims or pieces c c are provided on their inner sides, as herein shown, with substantially semicircular projections c3, which preferably rest upon the arbors or hubs of the rollers and serve to separate the rollers from one another.

The spacing-frame is made of such height that the upper and lower edges of the said frame are out of contact with the upper and lower bearing-surfaces, and to protect the rollers from dust the outer rims c c of the spacing-frame are extended below the guides b" Z910 ofthe upper and lower castings, the said guides constituting a track on which the rollers move.

In practice the upper plate and the weight supported by it rest entirely upon the body7 of the rollers, and the arbors or hubs of the same are substantially free from weight or pressure, the said arbors, as herein shown,

The hub h5 and annular rim or lip h6 servel to ta'ke up or resist shocks caused by the starting and stopping of the car.

The car-truck bolster (t has secured to it at or near its opposite ends anti-friction supports or bearings for the sides of the car-body.

Each side anti-friction support or bearing consists of a lower bearing-surface, (shown as a plate or castin g (Z,) provided, as shown, with ears or lugs (Z, having bolt-holes by which the said plate or casting may be secured to the car-t-ruck bolster (L. The lower plate or casting (Z is provided with ridges or guides (Z2, which form between them a track, upon which one or more of the anti-friction devices (shown as rollers orballs (Z3) are supported. The plate or cast-ing (Z between the guides (Z2 isinclined, as herein shown, to conform to the conical shape of the rollers (Z3, and the said lower plate or casting is provided with rack-teeth (Zt, with which mesh gear-teeth (Z5, preferably cut on the circumference of the roller (Z2. The guides (Z2 and rack-teeth (Z4, as herein shown, are made in the arc of a circle the center of which is the transverse center of the car-truck bolster. The rollers (Z3 arev provided with arbors (Zw, similar to the rollers D12 of the center bearing, and the said arbors, as herein shown, support a spacing-frame composed of side pieces or rims 6, joined by end pieces (Z2, provided with slots or grooves (Z8, into which enter the guides (Z2. The rollers (Z3 support the top or upper bearing-surface, (shown as a plate or casting (Z2, similar to the lower plate or castin g,)and the side pieces (Z6 ofthe spacing-f rame are located on the outside of the guides or ridges (Z2, so as to form a dust-guard to prevent dust gettin g inside the frame. The upper and lower edges of the side pieces (Z6 in practice are out of contact' with the upper and lower castings, thereby obviating friction between the said parts. The sides (ZG, as herein shown, are provided on their inner side with substantially semieircular projections (Zlo, which rest upon the arbors (Z5.

I prefer to cast the gear-teeth (Z5 integral with the roller, as shown in Fig. 9; but it is evident it may be cast separate therefrom and fit-ted upon the arbor inside the spacingframe. By casting the gea r-teeth integral with the roller the side bearing is rendered much simpler to construct. The upper part of the end pieces (ZT ot' the spacing-frame is also provided with slots or grooves (Zs to receive the guides (Z2 on the upper plate or castmg.

It will be noticed that in both the centerbearing and the side bearings the weight or pressure of the upperbearing-surface and the parts secured to it come directly upon the rollers, and that the only weight upon the arbors is that of the spacing-f rame, which is substantially nothing as compared with the weight of a car-body; also, that the spacingframe moves with the rollers and maintains the said rollers separated. Furthermore, it will be noticed that the ends of the rollers are separated from the sides of the spacingt'rame in the side bearing and also in the center bearing by a considerable distance, so that all friction between the ends of the said rollers and the sides of the spacing-frame is obviated; also, that the bearing-surfaces are fiat and the balls are free to roll or move on the said surfaces with unrestrained mot-ion. By this construction the friction between the upper and lower bearing-surfaces is reduced to a minimum.

I have herein shown the side bearing as provided with three rollers; but I do not desire to limit my invention to any particular number of rollers, as one or more may be used, for the gist of my invention consists in making the two bearing-surfaces flat-and parallel or substantially parallel, and provided with guides, and interposing between the said surfaces within the guides a roller or ball, which is free to move bodily between thesaid surfaces, the pressure or weight of the bearing-surfaces being exerted upon the body of the roller only and at diametrically-opposite points of said body.

The spacing-frame referred to, when two or more rollers are employed, serves the double purpose of a spacingframe and a dustguard, and in order that the dust may be more ef fectually excluded a strip or lining f, of felt ICO IOS

lIO

ISO

cr textile material, (see Fig, 11,) may be used between the spacing-frame and the upper and lower surfaces.

I claiml. In an anti-friction support or bearing, the combination, with two plane or flat bearingsurfaces provided with rack-teeth, of anr anti-friction roller or ball having an arbor provided with a gear to engage said rackteeth, and a spacing-frame supported by said arbor, substantially as described.

2. In an anti-friction support or bearing, the combination, with two flat or plain bear ing -surfaces, of an anti-friction conieallyshaped roller interposed between said snrfaces and provided with arbors extended beyond its ends, and an independent frame movable with the said roller, substantially as described.

3. In an anti-friction bearing or support, the combination, with two plane or fiat concentric bearing-surfaces, of anti-friction conically-shaped rollers provided with arbors, and having their peripheries inclined toward the center of the concentric bearing-surfaces, and an independent frame movable with the said anti-friction rollers, and having its sides` ont of contact with the ends of the said antifriction rollers, substantially as described.

4. In an anti-friction center bearing or support, the combination,with a bearing-surface b, provided with a hub having a hole h3 and with an annular rim b, forming with the said hub a groove or channel b4, a co-operating surface D7, provided with a lip or iiange D8 to enter the said groove or'channel,of antifriction devices interposed between the said bearing-surfaces outside of the rim b and provided with arbors, and a spacing-frame co-operatin g with said arbors to maintain the antifriction devices separated, substantially as described.

5. In an anti-friction center bearing or support, the combination, with a bearing-surface b, provided with a hub having a hole b3 and with an annular rim b, forming With the said hub a groove or channel b4, guides b9 D10 on said bearing-surface, a co-operating bearing-surface YJ?, provided with a lip or flange bs to enter the said groove or channel, of anti-fric tion devices interposed between the said bearing-surfaces outside of the rim h6 and pro vided with arbors, and a spacing-frame cooperating with said arbors to maintain said anti-friction devices separated, and having side pieces extended outside of and below the guides Zr bw, substantially7 as and for the purpose specified.

6. In an anti-friction side bearing or support, the combination, with a bearing-surface provided with 1'aclteeth and a co-operating bearing-surfaceprovided with 1'ack-teetli,ofan anti-friction conically-shaped roller provided with arbors and having gear-teeth to engage said rack-teeth, anda spacing-frame movable with the said arbors, substantially as described. I

7. In an anti-friction side bearing or support, the combination, with a bearing-surface provided with racksteeth and a co-operatinn bearing-surface provided with rack-teeth, of an anti-friction device provided with arbors and having gear-teeth to engage said rackteeth, and a spacing-frame having side pieces located outside of the said gears and movable with the said arbors, substantially as described.

S. In an anti-friction side bearing or snpport, the combination, with a bearing-surface provided with rack-teeth and having a guide and a co-operating bearingsurface provided with rack-teeth, of an anti-friction couically; shaped roller provided with arbors and having gear-teeth to engage said rack-teeth, and a spacing-frame having side pieces located outside of the said gears and movable with the said arbors, substantially as described.

In testimony whereof I have signed my name to this speciiieation in the presence of two subscribing witnesses.

LUTHER K. JEWETT.

Witnesses:

JAS. II. CHURCHILL, EMMA J. BENNETT. 

